I have a wall that is smooth (ish) large wood panels.
Originally, they were stained a wood color.
That has been painted over for years now.
I now need to bring the surface to super-smooth, so will be putting up a thin coat of spackle.
Can I spackle on the paint directly, or need I prime first? (The current paint is a light shade of latex based paint, probably 12 years old.)